document.write( "Question 817395: How many liters of 50% antiseptic solution must be added to 4 liters of a 20% solution in order to get a 30% antiseptic solution \n" ); document.write( "

Algebra.Com's Answer #492045 by josgarithmetic(39617) $\"\"$ $\"About$

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{amount of antiseptic}/{amount of antiseptic solution}={concentration of resulting solution}\r
\n" ); document.write( "\n" ); document.write( "Let x = amount of the 50% solution to use, in LITERS.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"highlight_green%28%2850x%2B4%2A20%29%2F%28x%2B4%29=30%29\"$
\n" ); document.write( "Divide both sides by 10,
\n" ); document.write( " $\"%285x%2B4%2A2%29%2F%28x%2B4%29=3\"$
\n" ); document.write( " $\"5x%2B8=3%28x%2B4%29\"$
\n" ); document.write( " $\"5x%2B8=3x%2B12\"$
\n" ); document.write( " $\"2x=12-8=4\"$
\n" ); document.write( " $\"highlight%28x=2%29\"$ \n" ); document.write( "

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